import { computed, ref, onUnmounted } from "vue";
import dayjs from "dayjs";
export const useCountDown = () => {
  // 响应式数据
  const time = ref(0);
  let timer = null;
  // 格式化时间，转换为xx分xx秒
  const formatTime = computed(() => dayjs.unix(time.value).format("mm分ss秒"));
  // 开始倒计时的函数
  const start = (currentTime) => {
    // 开始倒计时逻辑
    // 每隔1s就减1
    time.value = currentTime;
    timer = setInterval(() => {
      time.value--;
    }, 1000);
  };
  // 组件销毁时清除定时器(如果timer存在则清除)
  onUnmounted(() => {
    timer && clearInterval(timer);
  });
  return {
    formatTime,
    start,
  };
};
